
HOMEOSTASIS DALAM TUMBUHAN
Presentation
•
Science
•
1st - 3rd Grade
•
Hard
YEE Moe
Used 1+ times
FREE Resource
23 Slides • 0 Questions
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HOMEOSTASIS DALAM TUMBUHAN
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Rajah menunjukkan keadaan tumbuhan pada dua keadaan yang berbeza. Terangkan.
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Tumhuhan di bahagian merah jambu layu manakala tumbuhan di bahagian kuning segah.
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Apa akan terjadi jika tumbuhan kehilangan air yang terlalu banyak ?
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Bagaimanakah tumbuhan kehilangan air ?
Melalui daun ? datang ? akar ? bunga ?
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Tumbuhan kehilangan air daripada daun melalui stoma.
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Proses ini dinamakan TRANSPIRASI.
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Apakah kepentingan transpirasi ?
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Menyejukkan daun dan mencegah kepanasan melampau pada pokok.
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Transpirasi mengangkut air dari akar ke daun untuk proses fotosintesis.
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Selain air, garam mineral juga diserap oleh tumbuhan dari tanah ke seluruh bahagian pokok.
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Bagaimana kadar transpirasi tumbuhan pada cuaca yang panas ?
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Kadar transpirasi tumbuhan meningkat.
Apakah homeostasis tumbuhan pada suhu yang tinggi ?
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Pada suhu yang tinggi, stoma tertutup.
Keadaan ini membolehkan kurang air tersejat daripada daun.
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Pada waktu siang, stoma terbuka supaya lebihan air tersejat.
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HOMEOSTASIS DALAM TUMBUHAN
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